/*--------------------------------------------------------------------------
 *  Copyright 2011 Taro L. Saito
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *--------------------------------------------------------------------------*/
//--------------------------------------
// XerialJ
//
// TextSplit.java
// Since: 2011/05/26 12:41:48
//
// $URL$
// $Author$
//--------------------------------------
package org.xerial.silk.weaver.lens;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

public class TextSplit
{
    public File file;
    public long offset;
    public int  size;

    public TextSplit(File file, long offset, int size) {
        this.file = file;
        this.offset = offset;
        this.size = size;
    }

    public byte[] read() throws IOException {
        RandomAccessFile f = new RandomAccessFile(file, "r");
        f.seek(offset);

        byte[] buf = new byte[size];
        for (int index = 0;;) {
            int readBytes = f.read(buf, index, size - index);
            if (readBytes <= 0)
                break;
            index += readBytes;
        }
        return buf;
    }

}
